Is there a way to map a floating point value using a Bezier curve with nodes (Blender 2.8)?
A potential solution is to use the RGB Curve node, but focusing only on one of its channels. In the example below, I am passing as input a floating point value in the range [0.0, 1.0], and the node tree below does the following


Feed the input floating point value to the RGB Curve node (since the input is one-dimensional, we focus on only one of the RGB channels; red in this example)
Separate the output into the three color channels (RGB)
Isolate the red channel (at this point the output is still in the same range, [0, 1])
Multiply the red channel output by a (problem specific) scaling factor